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Open AccessArticle

A New Retrieval of Sun-Induced Chlorophyll Fluorescence in Water from Ocean Colour Measurements Applied on OLCI L-1b and L-2

Institute for Space Sciences, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12065 Berlin, Germany
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Remote Sens. 2020, 12(23), 3949; https://doi.org/10.3390/rs12233949
Received: 22 September 2020 / Revised: 17 November 2020 / Accepted: 28 November 2020 / Published: 2 December 2020
The retrieval of sun-induced chlorophyll fluorescence is greatly beneficial to studies of marine phytoplankton biomass, physiology, and composition, and is required for user applications and services. Customarily phytoplankton chlorophyll fluorescence is determined from satellite measurements through a fluorescence line-height algorithm using three bands around 680 nm. We propose here a modified retrieval, making use of all available bands in the relevant wavelength range, with the goal to improve the effectiveness of the algorithm in optically complex waters. For the Ocean and Land Colour Instrument (OLCI), we quantify a Fluorescence Peak Height by fitting a Gaussian function and related terms to the top-of-atmosphere reflectance bands between 650 and 750 nm. This algorithm retrieves, what we call Fluorescence Peak Height by fitting a Gaussian function upon other terms to top-of-atmosphere reflectance bands between 650 and 750 nm. This approach is applicable to Level-1 and Level-2 data. We find a good correlation of the retrieved fluorescence product to global in-situ chlorophyll measurements, as well as a consistent relation between chlorophyll concentration and fluorescence from radiative transfer modelling and OLCI/in-situ comparison. Evidence suggests, the algorithm is applicable to complex waters without needing an atmospheric correction and vicarious calibration, and features an inherent correction of small spectral shifts, as required for OLCI measurements. View Full-Text
Keywords: remote sensing; ocean colour; retrievals; fluorescence; optical properties; satellite; spectral; radiative transfer; optically complex waters; chlorophyll; absorption; scattering remote sensing; ocean colour; retrievals; fluorescence; optical properties; satellite; spectral; radiative transfer; optically complex waters; chlorophyll; absorption; scattering
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MDPI and ACS Style

Kritten, L.; Preusker, R.; Fischer, J. A New Retrieval of Sun-Induced Chlorophyll Fluorescence in Water from Ocean Colour Measurements Applied on OLCI L-1b and L-2. Remote Sens. 2020, 12, 3949. https://doi.org/10.3390/rs12233949

AMA Style

Kritten L, Preusker R, Fischer J. A New Retrieval of Sun-Induced Chlorophyll Fluorescence in Water from Ocean Colour Measurements Applied on OLCI L-1b and L-2. Remote Sensing. 2020; 12(23):3949. https://doi.org/10.3390/rs12233949

Chicago/Turabian Style

Kritten, Lena; Preusker, Rene; Fischer, Jürgen. 2020. "A New Retrieval of Sun-Induced Chlorophyll Fluorescence in Water from Ocean Colour Measurements Applied on OLCI L-1b and L-2" Remote Sens. 12, no. 23: 3949. https://doi.org/10.3390/rs12233949

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